.l{
    width: 156px;
    height: 170px;
    background-image: url(../img/精灵图.png);
    background-repeat: no-repeat;
    background-position: 6px -385px ;
}
.b{
    width: 150px;
    height: 200px;
    background-image: url(../img/精灵图.png);
    background-repeat: no-repeat;
    background-position: -171px 16px ;
}
.x{
    width: 150px;
    height: 200px;
    background-image: url(../img/精灵图.png);
    background-repeat: no-repeat;
    background-position: -366px -790px ;

}